diff options
Diffstat (limited to 'drivers/scsi/dec_esp.c')
| -rw-r--r-- | drivers/scsi/dec_esp.c | 573 |
1 files changed, 573 insertions, 0 deletions
diff --git a/drivers/scsi/dec_esp.c b/drivers/scsi/dec_esp.c new file mode 100644 index 00000000000..315f95a0d6c --- /dev/null +++ b/drivers/scsi/dec_esp.c @@ -0,0 +1,573 @@ +/* + * dec_esp.c: Driver for SCSI chips on IOASIC based TURBOchannel DECstations + * and TURBOchannel PMAZ-A cards + * + * TURBOchannel changes by Harald Koerfgen + * PMAZ-A support by David Airlie + * + * based on jazz_esp.c: + * Copyright (C) 1997 Thomas Bogendoerfer (tsbogend@alpha.franken.de) + * + * jazz_esp is based on David S. Miller's ESP driver and cyber_esp + * + * 20000819 - Small PMAZ-AA fixes by Florian Lohoff <flo@rfc822.org> + * Be warned the PMAZ-AA works currently as a single card. + * Dont try to put multiple cards in one machine - They are + * both detected but it may crash under high load garbling your + * data. + * 20001005 - Initialization fixes for 2.4.0-test9 + * Florian Lohoff <flo@rfc822.org> + * + * Copyright (C) 2002, 2003 Maciej W. Rozycki + */ + +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/slab.h> +#include <linux/blkdev.h> +#include <linux/proc_fs.h> +#include <linux/spinlock.h> +#include <linux/stat.h> + +#include <asm/dma.h> +#include <asm/irq.h> +#include <asm/pgtable.h> +#include <asm/system.h> + +#include <asm/dec/interrupts.h> +#include <asm/dec/ioasic.h> +#include <asm/dec/ioasic_addrs.h> +#include <asm/dec/ioasic_ints.h> +#include <asm/dec/machtype.h> +#include <asm/dec/tc.h> + +#define DEC_SCSI_SREG 0 +#define DEC_SCSI_DMAREG 0x40000 +#define DEC_SCSI_SRAM 0x80000 +#define DEC_SCSI_DIAG 0xC0000 + +#include "scsi.h" +#include <scsi/scsi_host.h> +#include "NCR53C9x.h" + +static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count); +static void dma_drain(struct NCR_ESP *esp); +static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp); +static void dma_dump_state(struct NCR_ESP *esp); +static void dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length); +static void dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length); +static void dma_ints_off(struct NCR_ESP *esp); +static void dma_ints_on(struct NCR_ESP *esp); +static int dma_irq_p(struct NCR_ESP *esp); +static int dma_ports_p(struct NCR_ESP *esp); +static void dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write); +static void dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp); +static void dma_mmu_get_scsi_sgl(struct NCR_ESP *esp, struct scsi_cmnd * sp); +static void dma_advance_sg(struct scsi_cmnd * sp); + +static void pmaz_dma_drain(struct NCR_ESP *esp); +static void pmaz_dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length); +static void pmaz_dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length); +static void pmaz_dma_ints_off(struct NCR_ESP *esp); +static void pmaz_dma_ints_on(struct NCR_ESP *esp); +static void pmaz_dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write); +static void pmaz_dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp); + +#define TC_ESP_RAM_SIZE 0x20000 +#define ESP_TGT_DMA_SIZE ((TC_ESP_RAM_SIZE/7) & ~(sizeof(int)-1)) +#define ESP_NCMD 7 + +#define TC_ESP_DMAR_MASK 0x1ffff +#define TC_ESP_DMAR_WRITE 0x80000000 +#define TC_ESP_DMA_ADDR(x) ((unsigned)(x) & TC_ESP_DMAR_MASK) + +u32 esp_virt_buffer; +int scsi_current_length; + +volatile unsigned char cmd_buffer[16]; +volatile unsigned char pmaz_cmd_buffer[16]; + /* This is where all commands are put + * before they are trasfered to the ESP chip + * via PIO. + */ + +static irqreturn_t scsi_dma_merr_int(int, void *, struct pt_regs *); +static irqreturn_t scsi_dma_err_int(int, void *, struct pt_regs *); +static irqreturn_t scsi_dma_int(int, void *, struct pt_regs *); + +static int dec_esp_detect(struct scsi_host_template * tpnt); + +static int dec_esp_release(struct Scsi_Host *shost) +{ + if (shost->irq) + free_irq(shost->irq, NULL); + if (shost->io_port && shost->n_io_port) + release_region(shost->io_port, shost->n_io_port); + scsi_unregister(shost); + return 0; +} + +static struct scsi_host_template driver_template = { + .proc_name = "dec_esp", + .proc_info = esp_proc_info, + .name = "NCR53C94", + .detect = dec_esp_detect, + .slave_alloc = esp_slave_alloc, + .slave_destroy = esp_slave_destroy, + .release = dec_esp_release, + .info = esp_info, + .queuecommand = esp_queue, + .eh_abort_handler = esp_abort, + .eh_bus_reset_handler = esp_reset, + .can_queue = 7, + .this_id = 7, + .sg_tablesize = SG_ALL, + .cmd_per_lun = 1, + .use_clustering = DISABLE_CLUSTERING, +}; + + +#include "scsi_module.c" + +/***************************************************************** Detection */ +static int dec_esp_detect(Scsi_Host_Template * tpnt) +{ + struct NCR_ESP *esp; + struct ConfigDev *esp_dev; + int slot; + unsigned long mem_start; + + if (IOASIC) { + esp_dev = 0; + esp = esp_allocate(tpnt, (void *) esp_dev); + + /* Do command transfer with programmed I/O */ + esp->do_pio_cmds = 1; + + /* Required functions */ + esp->dma_bytes_sent = &dma_bytes_sent; + esp->dma_can_transfer = &dma_can_transfer; + esp->dma_dump_state = &dma_dump_state; + esp->dma_init_read = &dma_init_read; + esp->dma_init_write = &dma_init_write; + esp->dma_ints_off = &dma_ints_off; + esp->dma_ints_on = &dma_ints_on; + esp->dma_irq_p = &dma_irq_p; + esp->dma_ports_p = &dma_ports_p; + esp->dma_setup = &dma_setup; + + /* Optional functions */ + esp->dma_barrier = 0; + esp->dma_drain = &dma_drain; + esp->dma_invalidate = 0; + esp->dma_irq_entry = 0; + esp->dma_irq_exit = 0; + esp->dma_poll = 0; + esp->dma_reset = 0; + esp->dma_led_off = 0; + esp->dma_led_on = 0; + + /* virtual DMA functions */ + esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one; + esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl; + esp->dma_mmu_release_scsi_one = 0; + esp->dma_mmu_release_scsi_sgl = 0; + esp->dma_advance_sg = &dma_advance_sg; + + + /* SCSI chip speed */ + esp->cfreq = 25000000; + + esp->dregs = 0; + + /* ESP register base */ + esp->eregs = (struct ESP_regs *) (system_base + IOASIC_SCSI); + + /* Set the command buffer */ + esp->esp_command = (volatile unsigned char *) cmd_buffer; + + /* get virtual dma address for command buffer */ + esp->esp_command_dvma = virt_to_phys(cmd_buffer); + + esp->irq = dec_interrupt[DEC_IRQ_ASC]; + + esp->scsi_id = 7; + + /* Check for differential SCSI-bus */ + esp->diff = 0; + + esp_initialize(esp); + + if (request_irq(esp->irq, esp_intr, SA_INTERRUPT, + "ncr53c94", esp->ehost)) + goto err_dealloc; + if (request_irq(dec_interrupt[DEC_IRQ_ASC_MERR], + scsi_dma_merr_int, SA_INTERRUPT, + "ncr53c94 error", esp->ehost)) + goto err_free_irq; + if (request_irq(dec_interrupt[DEC_IRQ_ASC_ERR], + scsi_dma_err_int, SA_INTERRUPT, + "ncr53c94 overrun", esp->ehost)) + goto err_free_irq_merr; + if (request_irq(dec_interrupt[DEC_IRQ_ASC_DMA], + scsi_dma_int, SA_INTERRUPT, + "ncr53c94 dma", esp->ehost)) + goto err_free_irq_err; + + } + + if (TURBOCHANNEL) { + while ((slot = search_tc_card("PMAZ-AA")) >= 0) { + claim_tc_card(slot); + + esp_dev = 0; + esp = esp_allocate(tpnt, (void *) esp_dev); + + mem_start = get_tc_base_addr(slot); + + /* Store base addr into esp struct */ + esp->slot = PHYSADDR(mem_start); + + esp->dregs = 0; + esp->eregs = (struct ESP_regs *) (mem_start + DEC_SCSI_SREG); + esp->do_pio_cmds = 1; + + /* Set the command buffer */ + esp->esp_command = (volatile unsigned char *) pmaz_cmd_buffer; + + /* get virtual dma address for command buffer */ + esp->esp_command_dvma = virt_to_phys(pmaz_cmd_buffer); + + esp->cfreq = get_tc_speed(); + + esp->irq = get_tc_irq_nr(slot); + + /* Required functions */ + esp->dma_bytes_sent = &dma_bytes_sent; + esp->dma_can_transfer = &dma_can_transfer; + esp->dma_dump_state = &dma_dump_state; + esp->dma_init_read = &pmaz_dma_init_read; + esp->dma_init_write = &pmaz_dma_init_write; + esp->dma_ints_off = &pmaz_dma_ints_off; + esp->dma_ints_on = &pmaz_dma_ints_on; + esp->dma_irq_p = &dma_irq_p; + esp->dma_ports_p = &dma_ports_p; + esp->dma_setup = &pmaz_dma_setup; + + /* Optional functions */ + esp->dma_barrier = 0; + esp->dma_drain = &pmaz_dma_drain; + esp->dma_invalidate = 0; + esp->dma_irq_entry = 0; + esp->dma_irq_exit = 0; + esp->dma_poll = 0; + esp->dma_reset = 0; + esp->dma_led_off = 0; + esp->dma_led_on = 0; + + esp->dma_mmu_get_scsi_one = pmaz_dma_mmu_get_scsi_one; + esp->dma_mmu_get_scsi_sgl = 0; + esp->dma_mmu_release_scsi_one = 0; + esp->dma_mmu_release_scsi_sgl = 0; + esp->dma_advance_sg = 0; + + if (request_irq(esp->irq, esp_intr, SA_INTERRUPT, + "PMAZ_AA", esp->ehost)) { + esp_deallocate(esp); + release_tc_card(slot); + continue; + } + esp->scsi_id = 7; + esp->diff = 0; + esp_initialize(esp); + } + } + + if(nesps) { + printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps, esps_in_use); + esps_running = esps_in_use; + return esps_in_use; + } + return 0; + +err_free_irq_err: + free_irq(dec_interrupt[DEC_IRQ_ASC_ERR], scsi_dma_err_int); +err_free_irq_merr: + free_irq(dec_interrupt[DEC_IRQ_ASC_MERR], scsi_dma_merr_int); +err_free_irq: + free_irq(esp->irq, esp_intr); +err_dealloc: + esp_deallocate(esp); + return 0; +} + +/************************************************************* DMA Functions */ +static irqreturn_t scsi_dma_merr_int(int irq, void *dev_id, struct pt_regs *regs) +{ + printk("Got unexpected SCSI DMA Interrupt! < "); + printk("SCSI_DMA_MEMRDERR "); + printk(">\n"); + + return IRQ_HANDLED; +} + +static irqreturn_t scsi_dma_err_int(int irq, void *dev_id, struct pt_regs *regs) +{ + /* empty */ + + return IRQ_HANDLED; +} + +static irqreturn_t scsi_dma_int(int irq, void *dev_id, struct pt_regs *regs) +{ + u32 scsi_next_ptr; + + scsi_next_ptr = ioasic_read(IO_REG_SCSI_DMA_P); + + /* next page */ + scsi_next_ptr = (((scsi_next_ptr >> 3) + PAGE_SIZE) & PAGE_MASK) << 3; + ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr); + fast_iob(); + + return IRQ_HANDLED; +} + +static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count) +{ + return fifo_count; +} + +static void dma_drain(struct NCR_ESP *esp) +{ + u32 nw, data0, data1, scsi_data_ptr; + u16 *p; + + nw = ioasic_read(IO_REG_SCSI_SCR); + + /* + * Is there something in the dma buffers left? + */ + if (nw) { + scsi_data_ptr = ioasic_read(IO_REG_SCSI_DMA_P) >> 3; + p = phys_to_virt(scsi_data_ptr); + switch (nw) { + case 1: + data0 = ioasic_read(IO_REG_SCSI_SDR0); + p[0] = data0 & 0xffff; + break; + case 2: + data0 = ioasic_read(IO_REG_SCSI_SDR0); + p[0] = data0 & 0xffff; + p[1] = (data0 >> 16) & 0xffff; + break; + case 3: + data0 = ioasic_read(IO_REG_SCSI_SDR0); + data1 = ioasic_read(IO_REG_SCSI_SDR1); + p[0] = data0 & 0xffff; + p[1] = (data0 >> 16) & 0xffff; + p[2] = data1 & 0xffff; + break; + default: + printk("Strange: %d words in dma buffer left\n", nw); + break; + } + } +} + +static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd * sp) +{ + return sp->SCp.this_residual; +} + +static void dma_dump_state(struct NCR_ESP *esp) +{ +} + +static void dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length) +{ + u32 scsi_next_ptr, ioasic_ssr; + unsigned long flags; + + if (vaddress & 3) + panic("dec_esp.c: unable to handle partial word transfers, yet..."); + + dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length); + + spin_lock_irqsave(&ioasic_ssr_lock, flags); + + fast_mb(); + ioasic_ssr = ioasic_read(IO_REG_SSR); + + ioasic_ssr &= ~IO_SSR_SCSI_DMA_EN; + ioasic_write(IO_REG_SSR, ioasic_ssr); + + fast_wmb(); + ioasic_write(IO_REG_SCSI_SCR, 0); + ioasic_write(IO_REG_SCSI_DMA_P, vaddress << 3); + + /* prepare for next page */ + scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3; + ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr); + + ioasic_ssr |= (IO_SSR_SCSI_DMA_DIR | IO_SSR_SCSI_DMA_EN); + fast_wmb(); + ioasic_write(IO_REG_SSR, ioasic_ssr); + + fast_iob(); + spin_unlock_irqrestore(&ioasic_ssr_lock, flags); +} + +static void dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length) +{ + u32 scsi_next_ptr, ioasic_ssr; + unsigned long flags; + + if (vaddress & 3) + panic("dec_esp.c: unable to handle partial word transfers, yet..."); + + dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length); + + spin_lock_irqsave(&ioasic_ssr_lock, flags); + + fast_mb(); + ioasic_ssr = ioasic_read(IO_REG_SSR); + + ioasic_ssr &= ~(IO_SSR_SCSI_DMA_DIR | IO_SSR_SCSI_DMA_EN); + ioasic_write(IO_REG_SSR, ioasic_ssr); + + fast_wmb(); + ioasic_write(IO_REG_SCSI_SCR, 0); + ioasic_write(IO_REG_SCSI_DMA_P, vaddress << 3); + + /* prepare for next page */ + scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3; + ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr); + + ioasic_ssr |= IO_SSR_SCSI_DMA_EN; + fast_wmb(); + ioasic_write(IO_REG_SSR, ioasic_ssr); + + fast_iob(); + spin_unlock_irqrestore(&ioasic_ssr_lock, flags); +} + +static void dma_ints_off(struct NCR_ESP *esp) +{ + disable_irq(dec_interrupt[DEC_IRQ_ASC_DMA]); +} + +static void dma_ints_on(struct NCR_ESP *esp) +{ + enable_irq(dec_interrupt[DEC_IRQ_ASC_DMA]); +} + +static int dma_irq_p(struct NCR_ESP *esp) +{ + return (esp->eregs->esp_status & ESP_STAT_INTR); +} + +static int dma_ports_p(struct NCR_ESP *esp) +{ + /* + * FIXME: what's this good for? + */ + return 1; +} + +static void dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write) +{ + /* + * DMA_ST_WRITE means "move data from device to memory" + * so when (write) is true, it actually means READ! + */ + if (write) + dma_init_read(esp, addr, count); + else + dma_init_write(esp, addr, count); +} + +static void dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp) +{ + sp->SCp.ptr = (char *)virt_to_phys(sp->request_buffer); +} + +static void dma_mmu_get_scsi_sgl(struct NCR_ESP *esp, struct scsi_cmnd * sp) +{ + int sz = sp->SCp.buffers_residual; + struct scatterlist *sg = sp->SCp.buffer; + + while (sz >= 0) { + sg[sz].dma_address = page_to_phys(sg[sz].page) + sg[sz].offset; + sz--; + } + sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address); +} + +static void dma_advance_sg(struct scsi_cmnd * sp) +{ + sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address); +} + +static void pmaz_dma_drain(struct NCR_ESP *esp) +{ + memcpy(phys_to_virt(esp_virt_buffer), + (void *)KSEG1ADDR(esp->slot + DEC_SCSI_SRAM + ESP_TGT_DMA_SIZE), + scsi_current_length); +} + +static void pmaz_dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length) +{ + volatile u32 *dmareg = + (volatile u32 *)KSEG1ADDR(esp->slot + DEC_SCSI_DMAREG); + + if (length > ESP_TGT_DMA_SIZE) + length = ESP_TGT_DMA_SIZE; + + *dmareg = TC_ESP_DMA_ADDR(ESP_TGT_DMA_SIZE); + + iob(); + + esp_virt_buffer = vaddress; + scsi_current_length = length; +} + +static void pmaz_dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length) +{ + volatile u32 *dmareg = + (volatile u32 *)KSEG1ADDR(esp->slot + DEC_SCSI_DMAREG); + + memcpy((void *)KSEG1ADDR(esp->slot + DEC_SCSI_SRAM + ESP_TGT_DMA_SIZE), + phys_to_virt(vaddress), length); + + wmb(); + *dmareg = TC_ESP_DMAR_WRITE | TC_ESP_DMA_ADDR(ESP_TGT_DMA_SIZE); + + iob(); +} + +static void pmaz_dma_ints_off(struct NCR_ESP *esp) +{ +} + +static void pmaz_dma_ints_on(struct NCR_ESP *esp) +{ +} + +static void pmaz_dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write) +{ + /* + * DMA_ST_WRITE means "move data from device to memory" + * so when (write) is true, it actually means READ! + */ + if (write) + pmaz_dma_init_read(esp, addr, count); + else + pmaz_dma_init_write(esp, addr, count); +} + +static void pmaz_dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp) +{ + sp->SCp.ptr = (char *)virt_to_phys(sp->request_buffer); +} |